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| DOI：10.13522/j.cnki.ggps.2025392 |
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| Integrated optimization of water-land resource allocation and cropping structure in large irrigation districts |
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CHEN Siyuan, CHENG Zhiyuan, ZHOU Ting, WANG Dongxia,
ZHU Feilin, ZHANG Qibing, JIAO Pingjin
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1. College of Hydrology and Water Resources, Hohai University, Nanjing 210024, China;
2. School of Engineering, Anhui Agricultural University, Hefei 230036, China;
3. Anhui Survey and Design Institute of Water Resources and Hydropower Co., Ltd., Hefei 230088, China;
4. Administration of Pishihang Irrigation District of Anhui Province, Lu’an 237005, China;
5. Anhui and Huaihe River Institute of Hydraulic Research (Huaihe River Commission of the Ministry of Water Resources),
Hefei 233088, China; 6. China Institute of Water Resources and Hydropower Research, Beijing 100048, China
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| Abstract: |
| 【Objective】Irrigation districts are essential for food security, and efficient allocation of water and land resources is fundamental to their sustainable production. A major challenge in many irrigation districts is the mismatch between agricultural water demand and natural water availability. This paper developed an optimization model by coupling water-land resource allocation with cropping structure adjustment to alleviate this mismatch.【Method】The proposed model minimizes total irrigation water shortage during the irrigation period by treating crop planting areas and grouped reservoir operation as the decision variables to coordinate regulation of both water supply and demand. The model was applied to the Pishihang Irrigation District in China to optimize water allocation from six reservoirs by adjusting rice cropping structure.【Result】Under the 80% design reliability scenario, the optimized scheme reduced the annual total water shortage by 94 million m3 compared with the conventional allocation scheme, while increasing the rice planting area by 20.1 thousand hectares. Under the consecutive dry-year scenario (2000–2001), the adjusted cropping structure, combined with inter-annual reservoir operation and full utilization of multi-year storage capacity, ensured water supply during critical crop growth stages. This increased the rice planting area from 74.0 thousand hectares in 2000 to 226.6 thousand hectares in 2001, significantly enhancing drought resilience and water supply reliability. Under a water-saving irrigation scenario, a 9%-10% reduction in irrigation quota resulted in a 9.7%-10.8% increase in rice planting area without increasing total water shortage.【Conclusion】The proposed model coordinated the optimization of spatiotemporal water resource allocation and cropping structure; it provides a quantitative decision-support tool for implementing the ‘Four Water Determinations’ principle and promotes the sustainable and efficient use of water and land resources in irrigation districts. |
| Key words: water and land resources optimization; cropping structure; reservoir operation; four water determinations; Pishihang irrigation district |
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